<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Slideshow</title>
    <style>
        div{width: 200px;height: 200px;}
        #div1{
            background-color: #0f6674;
            margin:0 0 0 -100px;
        }
        #div2{
            background-color: #1c7430;
            margin: 0 0 0 -100px;
        }
        #div3{
            background-color:#005cbf;
            margin: 100px 0 0 100px;
        }
    </style>
</head>
<body>
<div>
    <div id="div1">
        <div id="div2">
            <div id="div3"></div>
            <div id="div4"></div>
        </div>
    </div>


</div>

</body>
</html>